Jefferson Lab Weekly Briefs
July 10, 2013

12 GeV Upgrade

Work is well underway in both the North and South Linac Service buildings to provide additional cooling capability. In Hall C, assembly of the support structure for the new Super High Momentum Spectrometer has also begun. Note that new construction work areas have been established, which will require additional Personal Protective Equipment for entry, and access will be restricted to those having a need to be there.

Center for Theoretical and Computational Physics

Nucleon off-shell effects can play a significant role in nuclear processes. A new Theory Center paper presents an off-shell extrapolation of a Regge model describing nucleon-nucleon scattering. The off-shell model is used to calculate deuteron electrodisintegration cross sections, and comparisons are made with data from Jefferson Lab experiments.

JLab Calendar of Events

July 10: PEPPo Collaboration meeting
July 10-11: GlueX Collaboration meeting
July 22: Safety Shoe vendor onsite
July 29-31: Q-weak Collaboration meeting
Aug. 2: Summer Interns Poster Session

Environment, Safety, Health and Quality

Confined Spaces
Confined Spaces is a term that evokes different imagery for different people. At Jefferson Lab, a Confined Space is defined by the U.S. Occupational Safety and Health Administration as an area that:

  • has limited means of entering and exiting,
  • is not designed for routine human occupancy,
  • is large enough to enter and conduct work, and
  • may (or may not) have atmospheric hazards and/or physical hazards, as these hazards make it a Permit Required Confined Space.

A particular feature is that if any part of your body can "break the entry plane" into the space, it is considered an entry into that space.

If you encounter a situation or a space with a sign (or painted warning) indicating that a Confined Space exists, and you have not been properly trained (SAF907), do not enter the space. Remember this is different from an Oxygen Deficient Hazard (ODH) assessment. For more information about Confined Spaces, see ES&H Manual Chapter 6160 Permit-Required Confined Space (PRCS) Entry Program or the OSHA website.

Computing and Networking Infrastructure

CNI Systems Maintenance Period Set for July 16, 5-7 p.m.
The CNI group is planning a Systems Maintenance Period for 5-7 p.m. on Tuesday, July 16. During this maintenance period, Zimbra email will be down for about 30 minutes while an update is installed. Jlabl1-4, login1 and login2, hallgw, acelogin, and CNI-managed web servers will be rebooted to install patches; the outage for each system will be short (about 5-10 minutes). Additionally, Firefox, Thunderbird and Adobe Flash will all be updated to the latest versions on CNI-managed Windows systems. Finally, Windows and Linux patches will be deployed on all Common User Environment (CUE) desktop systems. Plan on rebooting your desktop system to finalize these patch installations on the following Wednesday or Thursday (July 17-18). If you have any questions or concerns about this planned maintenance period, contact the IT Division Helpdesk, x7155.

Site-Wide Network Outage Set for Saturday, July 20
On Saturday, July 20, a site-wide network outage is scheduled for 8 a.m.-noon for equipment upgrades. This outage will disrupt Internet access, wifi and landline telephones. Although the outage window is four hours, the most critical services, which include phones, Internet and central servers, will be restored first. This outage does not include the accelerator controls network itself. For questions about this work, contact the IT Division Helpdesk.

Announcements

Reminder: Revised General Access Radiological Worker Permit
The Radiation Control group has revised the 2013 General Access RWP to reflect changes to items coming out of the north and south linacs. This new revised GARWP must be signed by July 15 by all Radiation Workers to retain their qualifications and to gain entrance to the accelerator site.

The GARWP is titled SAF801kd, and the change is located in the middle of page 3, item #9. A revision date of June 25, 2013, should be shown in the upper left hand corner of this document. Make sure you refresh your browser once you have opened this document, to make sure you have the newest version. You can locate the document on the web-based training page. If you have questions or concerns, contact Becky Mosbrucker, x7236, or the RadCon Technician cell phone, 876-1743.

Tracking Thomas at Jefferson Lab
Little Thomas is visiting all corners of the Jefferson Lab campus. If you can identify his location this week, email Kandice Carter with your guess. Guesses are accepted through Friday.

Silvia Niccolai, Samika Hawkins, Jacob Pomeranz, Susan Brown and DeAnn Maddox correctly guessed the location for July 3. Honorable mentions go to Michael Haddox-Schatz, Harry Fanning, Narciso Gomez, Sam Holben, Brita Hampton, Dick Owen, Buddhini Waidyawansa, Carlos Ayerbe-Gayoso, James Thomas and John Root. Check out Tracking Thomas on flickr for a better view of his last location and this week's new mystery photo.

JLab Weekly Briefs is an ongoing publication providing information on the status of safety, accelerator operations, experiments, free-electron laser, reviews, upcoming activities and special events. Deadline for submission is every Tuesday by 10 a.m. Submit new items to: Public Affairs or contact Kandice Carter at x7263.